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Algal Sand (Substrate Subclass)

Component: Substrate

Unique Identifier: 308

Substrate Origin Biogenic Substrate
Substrate Class Algal Substrate
Substrate Subclass Algal Sand
Substrate Group Halimeda Sand

Definition Biogenic Substrate that is primarily composed of broken down calcareous algae with a median particle size of 0.0625 millimeters to < 2 millimeters (Sand). This Sand may have a characteristic white color as it becomes bleached by the sun. However, when the composition and origin of Sand is unclear, it is assumed to be mineral Sand, and is classified as a Geologic Origin substrate.